package com.atguigu.ucenter.controller;

import com.atguigu.base.ExceptionHnadler.CustomException;
import com.atguigu.ucenter.entity.Member;
import com.atguigu.ucenter.service.MemberService;
import com.atguigu.ucenter.utils.ConstantWxUtils;
import com.atguigu.ucenter.utils.HttpClientUtils;
import com.atguigu.utils.JwtUtils;
import com.google.gson.Gson;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.annotation.Resource;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

//@CrossOrigin
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxController {

    @Resource
    private MemberService memberService;
    //生成微信扫描二维码
    @GetMapping("/login")
    public String getWxCode(){
        //固定地址，后面拼接参数
        String url = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行编码
        String redirectUrl= ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl= URLEncoder.encode(redirectUrl, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        String finalUrl = String.format(
                url,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu");
        //重定向到请求微信地址里面
        return "redirect:"+finalUrl;
    }
    //获取token
    @GetMapping("/callback")
    public String string(String code,String state){
        try{
        //1 获取code值，临时票据，类似于验证码
        //2 拿着code请求 微信固定的地址，得到两个值 accsess_token 和 openid
        String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                "?appid=%s" +
                "&secret=%s" +
                "&code=%s" +
                "&grant_type=authorization_code";
        //拼接三个参数 ：id  秘钥 和 code值
        String accessTokenUrl = String.format(
                baseAccessTokenUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                ConstantWxUtils.WX_OPEN_APP_SECRET,
                code
        );
        //请求这个拼接好的地址，得到返回两个值 accsess_token 和 openid
        //使用httpclient发送请求，得到返回结果
        String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

        //从accessTokenInfo字符串获取出来两个值 accsess_token 和 openid
        //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
        //使用json转换工具 Gson
        Gson gson = new Gson();
        HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
        String access_token = (String)mapAccessToken.get("access_token");
        String openid = (String)mapAccessToken.get("openid");

        //把扫描人信息添加数据库里面
        //判断数据表里面是否存在相同微信信息，根据openid判断
        Member member = memberService.getOpenIdMember(openid);
        if(member == null) {//memeber是空，表没有相同微信数据，进行添加

            //3 拿着得到accsess_token 和 openid，再去请求微信提供固定的地址，获取到扫描人信息
            //访问微信的资源服务器，获取用户信息
            String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                    "?access_token=%s" +
                    "&openid=%s";
            //拼接两个参数
            String userInfoUrl = String.format(
                    baseUserInfoUrl,
                    access_token,
                    openid
            );
            //发送请求
            String userInfo = HttpClientUtils.get(userInfoUrl);
            //获取返回userinfo字符串扫描人信息
            HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
            String nickname = (String)userInfoMap.get("nickname");//昵称
            String headimgurl = (String)userInfoMap.get("headimgurl");//头像

            member = new Member();
            member.setOpenid(openid);
            member.setNickname(nickname);
            member.setAvatar(headimgurl);
            memberService.save(member);
        }

        //使用jwt根据member对象生成token字符串
        String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
        //最后：返回首页面，通过路径传递token字符串，因为cookie不能跨域

        return "redirect:http://localhost:3000?token="+jwtToken;
    }catch(Exception e) {
        throw new CustomException(20001, "微信扫码登录失败");
      }
    }
}
